// UC_MD5.h

#ifndef _UC_MD5_H_
#define _UC_MD5_H_

#include "UH_Define.h"

class UC_MD5
{
	// POINTER defines a generic pointer type
	typedef unsigned char* POINTER;
	
	// UINT2 defines a two byte word
	typedef unsigned short UINT2;
	
	// UINT4 defines a four byte word
	typedef unsigned int UINT4;
	
	// UINT8 defines a eight byte word
	#ifdef WIN32
		typedef unsigned __int64 UINT8;
	#else
		typedef unsigned long long UINT8;
	#endif
	
	// Constants for MD5Transform routine.	
	#define S11 7
	#define S12 12
	#define S13 17
	#define S14 22
	#define S21 5
	#define S22 9
	#define S23 14
	#define S24 20
	#define S31 4
	#define S32 11
	#define S33 16
	#define S34 23
	#define S41 6
	#define S42 10
	#define S43 15
	#define S44 21
	
	// F, G, H and I are basic MD5 functions.
	#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
	#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
	#define H(x, y, z) ((x) ^ (y) ^ (z))
	#define I(x, y, z) ((y) ^ ((x) | (~z)))
	
	// ROTATE_LEFT rotates x left n bits.
	#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
	
	// FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. Rotation is separate from addition to prevent recomputation.
	#define FF(a, b, c, d, x, s, ac) { (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
									   (a) = ROTATE_LEFT ((a), (s)); \
									   (a) += (b); }
	#define GG(a, b, c, d, x, s, ac) { (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
									   (a) = ROTATE_LEFT ((a), (s)); \
									   (a) += (b); }
	#define HH(a, b, c, d, x, s, ac) { (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
									   (a) = ROTATE_LEFT ((a), (s)); \
									   (a) += (b); }
	#define II(a, b, c, d, x, s, ac) { (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
									   (a) = ROTATE_LEFT ((a), (s)); \
									   (a) += (b); }
	
	// static unsigned char PADDING[64];
	unsigned char PADDING[64];

	typedef struct {
		UINT4 state[4];            /* state (ABCD) */
		UINT4 count[2];            /* number of bits, modulo 2^64 (lsb first) */
		unsigned char buffer[64];  /* input buffer */
	} MD5_CTX;	

	/* MD5 initialization. Begins an MD5 operation, writing a new context.
	*/
	void MD5Init (MD5_CTX *context)
	{
		context->count[0] = context->count[1] = 0;
		/* Load magic initialization constants.
		*/
		context->state[0] = 0x67452301;
		context->state[1] = 0xefcdab89;
		context->state[2] = 0x98badcfe;
		context->state[3] = 0x10325476;
	}
	
	/* MD5 block update operation. Continues an MD5 message-digest
	operation, processing another message block, and updating the
	context.
	*/
	void MD5Update (MD5_CTX *context, unsigned char *input, unsigned int inputLen)
	{
		unsigned int i, index, partLen;
		
		/* Compute number of bytes mod 64 */
		index = (unsigned int)((context->count[0] >> 3) & 0x3F);
		
		/* Update number of bits */
		if ((context->count[0] += ((UINT4)inputLen << 3))
			< ((UINT4)inputLen << 3))
			context->count[1]++;
		context->count[1] += ((UINT4)inputLen >> 29);
		
		partLen = 64 - index;
		
		/* Transform as many times as possible.
		*/
		if (inputLen >= partLen) {
			MD5_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
			MD5Transform(context->state, context->buffer);
			
			for (i = partLen; i + 63 < inputLen; i += 64)
				MD5Transform (context->state, &input[i]);
			
			index = 0;
		}
		else
			i = 0;
		
		/* Buffer remaining input */
		MD5_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],
			inputLen-i);
	}
	
	/* MD5 finalization. Ends an MD5 message-digest operation, writing the
	the message digest and zeroizing the context.
	*/
	void MD5Final (unsigned char digest[16], MD5_CTX *context)
	{
		unsigned char bits[8];
		unsigned int index, padLen;
		
		/* Save number of bits */
		Encode (bits, context->count, 8);
		
		/* Pad out to 56 mod 64.
		*/
		index = (unsigned int)((context->count[0] >> 3) & 0x3f);
		padLen = (index < 56) ? (56 - index) : (120 - index);
		MD5Update (context, PADDING, padLen);
		
		/* Append length (before padding) */
		MD5Update (context, bits, 8);
		
		/* Store state in digest */
		Encode (digest, context->state, 16);
		
		/* Zeroize sensitive information.
		*/
		MD5_memset ((POINTER)context, 0, sizeof (*context));
	}
	
	/* MD5 basic transformation. Transforms state based on block.
	*/
	void MD5Transform (UINT4 state[4], unsigned char block[64])
	{
		UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
		
		Decode (x, block, 64);
		
		/* Round 1 */
		FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
		FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
		FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
		FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
		FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
		FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
		FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
		FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
		FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
		FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
		FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
		FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
		FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
		FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
		FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
		FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
		
		/* Round 2 */
		GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
		GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
		GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
		GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
		GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
		GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
		GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
		GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
		GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
		GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
		GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
		GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
		GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
		GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
		GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
		GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
		
		/* Round 3 */
		HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
		HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
		HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
		HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
		HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
		HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
		HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
		HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
		HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
		HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
		HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
		HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
		HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
		HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
		HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
		HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
		
		/* Round 4 */
		II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
		II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
		II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
		II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
		II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
		II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
		II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
		II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
		II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
		II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
		II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
		II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
		II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
		II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
		II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
		II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
		
		state[0] += a;
		state[1] += b;
		state[2] += c;
		state[3] += d;
		
		/* Zeroize sensitive information.	  
		Rivest   [Page 14]
		 
			RFC 1321  MD5 Message-Digest Algorithm   April 1992
		*/
		MD5_memset ((POINTER)x, 0, sizeof (x));
	}
	
	/* Encodes input (UINT4) into output (unsigned char). Assumes len is
	a multiple of 4.
	*/
	void Encode (unsigned char *output, UINT4 *input, unsigned int len)
	{
		unsigned int i, j;
		
		for (i = 0, j = 0; j < len; i++, j += 4) {
			output[j] = (unsigned char)(input[i] & 0xff);
			output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
			output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
			output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
		}
	}
	
	/* Decodes input (unsigned char) into output (UINT4). Assumes len is
	a multiple of 4.
	*/
	void Decode (UINT4 *output, unsigned char *input, unsigned int len)
	{
		unsigned int i, j;
		
		for (i = 0, j = 0; j < len; i++, j += 4)
			output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
			(((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
	}
	
	/* Note: Replace "for loop" with standard memcpy if possible.
	*/	
	void MD5_memcpy(POINTER output, POINTER input, unsigned int len)
	{
		unsigned int i;
		
		for (i = 0; i < len; i++)
			output[i] = input[i];
	}
	
	/* Note: Replace "for loop" with standard memset if possible.
	*/
	void MD5_memset (POINTER output, int value, unsigned int len)
	{
		unsigned int i;
		
		for (i = 0; i < len; i++)
			((char *)output)[i] = (char)value;
	}

public:	
	UC_MD5()
	{
		memset(PADDING, 0, 64);
		PADDING[0] = 0x80;
	}

	/* Digests a string and prints the result.
	*/
	UINT4 MD5Bits32(unsigned char * input, unsigned int inputLen)
	{
		unsigned char usDigest[16];
		
		MD5Bits128(usDigest, input, inputLen);
        		
		return *(unsigned int *)usDigest;
	}
	
	UINT8 MD5Bits64(unsigned char * input, unsigned int inputLen)
	{
		unsigned char usDigest[16];
		
		MD5Bits128(usDigest, input, inputLen);	
		//printf("%.*s == "CP_PU64"\n", inputLen, input, *(UINT8*)usDigest);
		return *(UINT8*)usDigest;    
	}
	
	void MD5Bits128(unsigned char output[], unsigned char * input, unsigned int inputLen)
	{
		if(inputLen <= 0)
		{
			memset(output, 0, 16);
			return;
		}
			
		MD5_CTX context;
		MD5Init(&context);
		MD5Update(&context, input, inputLen);
		memset(output, 0, 16);
		MD5Final(output, &context);
	}
};

// unsigned char UC_MD5::PADDING[64] = { 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

#endif // #define _UC_MD5_H_

